This is the 3302nd most frequent Russian word.
отставку
Resignation or retirement.
Here, 'отставку' refers to resignation, used with the verb 'подал' to describe the act of voluntarily leaving a position.
Он подал в отставку с поста генерального директора.
He resigned from the position of CEO.
In this usage, 'отставку' signifies an officially offered resignation, and its acceptance is highlighted.
Президент принял отставку министра.
The president accepted the minister's resignation.
Here, 'отставку' represents retirement or stepping down, usually after a period of substantial contribution.